Do you mean 810 or SS+, esk?
810 can't be just packs - it's 3 Cambridge packs, 340ml skimmed milk and a meal (large-ish portion of protein with 3 tbsp of veg)
SS+ is 3 Cambridge packs and a meal (a smaller portion of protein than on 810 and 2 tbsp of veg) or 4 Cambridge packs and 200ml of skimmed milk.
The difference to weight loss between SS+ and SS is tiny, maybe a quarter to half a pound a week.
But then the difference in weight loss between SS and 810 also isn't very big, maybe half a pound to three quarters of a pound a week difference.